Luminaire



LUMINAIRE 2 Sheets-Sheet` 1 Filed June 29, 1955 s a n. ,I n T S e N Nm Rl www .v m vm N |T.R. 7M 6IW A wma RD ow Nm o mm ,NN m ww Nw wm w. h 4so \J mm ow mm o E. G ww 9 Nm @N NN wm 1| vw 4 |11 8 k mw om o mw w @nmm {wm v N NV, NW wb .l am mm 2. mm\m 3 K. Nm ml mw n b om N. m l .E vmNN olv A N, N X. n m vw T w 1 w m ,.v l, s /1 .m M fl. w

L A T E S N R U B T.. .n

LUMINAIRE 2 Sheets-Sheet 2 Filed June 29, 1955 ma. f-

LUMINAIRE Robert T. Burns, Bay Viilage, and Dana W. Rowten, Lakewood,hio, assignors to Westinghouse Electric Corporation, East Pittsburgh,Pa., a corporation of Pennsylvania Application lune 29, 1955, Seriai No.518,844

9 Claims. (Cl. 20W-MS) This invention relates generally to luminairesand more particularly to a luminaire which is employed in serieslighting circuits.

While luminaires of this general type have been previously used inmercury street lighting systems, the mercury lamp in each luminaire hasbeen individually controlled which construction is fairly expensive dueto the necessity of so providing the control components in and for eachluminaire. ln order to eliminate such expensive duplication of controlcomponents, we have designed a new and improved luminaire which utilizesa mercury vapor lamp and has a novel form of housing so that theluminaire may readily be used in a series circuit.

One object of this invention, therefore, is to provide a luminairehaving a novel form of housing which utilizes a mercury vapor lamp andis adapted for use in a series circuit.

Another object of this invention is to provide a luminaire which isadapted for use in a series circuit having an elongated cavity betweenthe lamp and the luminaire supporting means for receiving a lm cutoutsupport means therein.

Still another object of this invention is to provide a simplified formof luminaire for series street lighting or the like service, employingan elongated housing lin which series circuit control elements arelocated `in a novel manner so that the luminaire may be readilyserviced.

A more specific object of this invention is to provide a vluminairewhich is vadapted for use in a series-circuit having an elongated cavitybetween the lamp and the luminaire support means, which cavity isaccessible by means of a door member having a lm cutout secured thereto,and which lm cutout is receivable within a receptacle secured to theluminaire in the cavity.

These and other objects of this invention will become more apparent uponconsideration of the following detailed description of a preferredembodiment thereof, when taken in connection with the attached drawings,in which:

Figure l is a side sectional View of a luminaire constructed inaccordance with this invention, with certain of the parts shown inelevation and showing a ilm holder and a film receptacle locatedtherein;

Fig. 2 is an enlarged top plan view of the film holder shown in Fig. 1;

Fig. 3 is a partial side elevational and partial cross-y sectional viewof the film holder shown in Fig. 2, taken substantially along the lineIII-III thereof;

Fig. 4 is an enlarged top plan view of the film receptacle shown in Fig.1;

Fig. 5 is a partial side elevational and partial crosssectional view ofthe film receptacle shown in Fig. 4, taken substantially along the lineV-V thereof; and

Fig. 6 is a cross-sectional view of the lm holder and film receptacle,shown in Figs. 2 and 4, respectively, 70

which are shown in assembled relationship.

While the invention is herein specifically disclosed as embodied in astreet lighting type of luminaire, it should 2,849,574 Patented Aug. 26,1958 rei ICC

be understood at the outset that the invention in its various aspectsmay find application in other types of luminaires than that specificallyherein disclosed, and consequently tne following specific disclosure isnot intended as limiting with respect to any of the features of thisinvention.

The luminaire shown on the drawings is depicted :as having an elongatedhousing which is formed of one integral piece of material, preferably asingle metal casting, of a material such for example, as aluminum' or analuminum alloy. The luminaire housing has an enlarged portion 2 which isgenerally ovate in form and is provided with a generally ovate bottomopening so that it forms in effect one-half of an ovate spheroid. Anelongated hollow sleeve 4 is formed integral with the housing andextends longitudinally outward from the housing substantially inalignment with the major axis of the ovate portion 2. The outer endportion of sleeve 4 is adapted to receive the end portion of anelongated mounting bracket therein (not shown) of well known size andconstruction, and it is provided with opposed set screws 6 inwardly fromits outer end for engaging vsuch a bracket, and adjusting the positionof the luminaire thereon. A U-bolt 8 is mounted adjacent the outer endof the bracket receiving portion of sleeve 4 so as to be movable in aslot 10 provided in the lower portion of sleeve 4 adjacent its outerend. U-bolt 8 is adapted to be drawn up into clamping engagement withsuch a mounting bracket when inserted in the bracket receiving portionof sleeve 4, to firmly secure the luminaire on any such bracket. Inorder to limit the longitudinal distance, the end of such a bracket maybe inserted within sleeve 4. Sleeve 4 is provided with an integrallaterally inwardly projecting ange 12 which is spaced inwardly of theouter end of sleeve 4 and the screws 6 so as to be in the path oflongitudinal inward movement of such a bracket. Flange 12 is providedwith 1a central opening 18 to permit electrical conductors 99, only oneof which is shown, to extend therethrough. Although not shown, it is tobe realized that conductors 99 extend outward of sleeve 4 so as to besecured to a suitable source of electrical energy in any well knownmanner.

The luminaire housing also has formed integrally therewith a pair oflongitudinally extending reinforcing ribs, not shown, which extendgenerally longitudinally from the sleeve 4 of the housing, over themajor part of the length of the ovate portion Z in divergent relation toprovide suicient structural strength to support'the ovate portion Z. Thebottom opening of the ovate portion 2 is provided with an outwardlyextending `integral ange 14 which has a ydownwardly extending lipportion' 16 at its outer edge. At the end of the ovate portion 2opposite the sleeve 4, there are provided integral, spaced outwardlyextending ears 20, only one of which is shown, for a purpose which willbe hereinafter described.

A reflector 22 is adapted to be mounted within the ovate portion 2, andis formed of one piece of sheet material, and is generally of the sameform as the ovate portion 2. Preferably, therellector 22 is stamped froma single sheet of metal .which is capable of being provided withgoodreecting characteristics, such as aluminum sheet which can bepolished and/or anodized to provide a good reecting surface. Ovateportion 2 has a plurality ofspaced, integral supporting bosses 24depending from the inner surface thereof, which bosses '.24

2. Boss 34 is located inwardly of the ovate portion 2 adjacent the innerend of sleeve 4 and extends laterally with respect to the sleeve 4. Thecentral portion of the lower surface of boss 34 is arcuate in form withits center extending upwardly toward the upper wall of the housing so asto closely engage the upper curved surface of a cylindrical socketreceiving portion 28 of a lampholder 30. Lampholder 36 may be formedfrom any suitable insulating material; however, it is preferably formedfrom a high dielectric strength molded porcelain. As shown, a curvedstrap 32, of any suitable material such as steel, extends around thelower curved surface of the socket receiving portion 2S of lampholder30. Strap 32 is provided with a laterally outwardly extending fiangeportion 97 at each of its ends (only one of which is shown) whichengages the laterally extending and spaced lower surfaces at each sideof boss 34. Thereafter lampholder 30 may be secured to boss 34 by anysuitable means such as screws 36, only one of which is shown, extendingthrough the anges of strap 32 and threadedly engaging upwardly extendingopenings (not shown) in the laterally extending lower surfaces of boss34.

The socket portion 28 of larnpholder 30 is provided with a cylindricalrecess 38 which is open at its end facing the center of ovate portion 2.Recess 38 is of a size to receive a circular screw base socket 42 of anysuitable material, such as a copper alloy, therein. The socket 42, asherein illustrated, is of the screw base type for receiving a lamp 46having a screw base; however, if desired, other types of lamps havingother types of bases could be employed by supporting a cooperable typesocket in the recess 2S of lampholder 30. The lamp 46 is illustrated asbeing elongated in form and is preferably of the high intensity mercurytype. The particular lamp 46 illustrated, when mounted in the socket 42lies substantially on the longitudinal center line of the ovate portion2 of the housing and the reflector 22, at or slightly above the loweredge of the reflector 22.

In most cases, it will be desirable to provide a refractor 54 over thebottom opening in the ovate portion 2 of the housing, which may be rnadeof any desired transparent material, such as glass, and it may beadditionally formed with various interior and/or exterior prisms fordirecting the light rays passing therethrough in the desired pattern.The upper open end of the refractor 54 has an integral outside rib 56which is adapted to be engaged by a clamping band 58 which surrounds theupper open end of the refractor 54 and has laterally extending aperturedends 59 at one side of ovate portion 2 for receiving a clamping bolt 60to securely clamp the band y 5'8 to the upper end of the refractor 54.

The refractor 54 is adapted to be releasably supported in closedrelation with the bottom opening in the housing by a pivot support atone end adjacent the sleeve 4, which comprises a pair of supporting arms62 provided integral with clamping band S8 and joined at their outerends by pivot pin 64 which is adapted to be removably mounted in ahook-shaped support 66 which is secured to the underside of the housingat the sleeve 4 in any desired manner, such as by mounting screws 68.There is also provided a leaf spring 70 which is secured to the clampingband 58 intermediate the pivot supporting arms 62, and which isengageable with a lip 61 formed integral with the housing.

At the other end of the housing and the refractor 54, the clamping band58 for the refractor 54 is provided with an integral latch projection 72extending outwardly therefrom for engagement with a movable latch 74,which is generally U-shaped in cross section. The movable latch 74 isadapted to be mounted on a pivot pin 76 extending between the supportingears 20 on the housing 2, and is biased in a counterclockwise directionas viewed in Fig. l to latching position, by a coil spring 7 8 mountedon the pivot pin 76 and reacting against the housing and the movablelatch 74 at its opposite ends, respectively.

The movable latch 74 is also provided with a latch reset roller 80mounted on a pin connecting the sides thereof, and with an integrallatch projection 82 also located between the sides thereof, preferablyformed with transverse ridges 84 on the upper side thereof. lf desired,a light shield 86 of opaque material, such as aluminum or the like, maybe inserted in the refractor 54 and held therein in any suitable way,such as by a frictional fit, toward the sleeve 4 end of the refractor 54and housing.

The refraetor 'oowl 54 is illustrated in Fig. l as being latched inposition where its upper rim is in engagement with a sealing gasket 87,which in turn engages the lower flange Llof the housing 2. Preferablythe gasket S7 is of a weatherproof material, such as neoprene or thelike, and is in compressed condition at the closed position of therefractor 5d, to exclude the elements from the luminaire, and it will beobserved that the downwardly extending lip i6 on the housing flange 14further acts to protect the seal between the refractor bowl 54 and thehousing 2. lf it is desired to open the luminaire for lamp replacementor for cleaning purposes, it is merely necessary to release the movablelatch member 74 by moving the lower end to the left as viewed in Fig. l,until its latch projection 82 and reset roller 30 clear the latchprojection 72 on the clamping band 5d. Refractor 54 is then freed sothat its pivot pin 64 can dro-p down to the bottom of the slot inbracket 66 and pivot downwardly about the pivot pin 64. During suchdownward movement the leaf spring 7i), previously referred to, moves upand disengages the lip 61 on the housing. The refractor 54 may then bereadily replaced by rotating it a further amount until flat surfaces onarms 62 are at a position to Iclear screws 613 whereupon the refr-actor54 may be merely lifted to move its pivot pin 64 out of the slots insupport 66 on the housing, and a new refractor 5d in- Aerted in itsplace. Thereafter, the luminaire may be closed merely oy swinging therefractor 54 back to the position shown in Fig. l, and this results inautomatically latching it in closed position, as the latch projection'l2 on the refractor 54 will engage the reset roller 30 on the movablelatch 74 during closing movement of the refractor 54, to move themovable latch mem er 7 in a clockwise direction and to enable the latchprojection 72 to slip past the roller and latch projection 82, whereuponthe biasing spring 73 for the movable latch member 74 lwill cause it tomove back where its latch projection 82 engages beneath the latchprojection 72 on lthe refractor 54, to thereby latch it in the closedposition shown in Fig. l of the drawings. During closing movement of therefractor 54, the free end of Spring 70 ultimately engages the lip 6l onthe housing. Thereafter, pivot pin 64 is lifted in the slots of support66 while pivotal 4movement continues about the free end of spring 70.When the adjacent edge of refractor 54 engages gasket 87, spring 7) isstressed, and the gasket is placed under spring pressure.

It Will be noted that the construction of the housing 2, refractor 54, aportion of sleeve 4, and various cooperating members therewith issimilar to those elements which are more completely shown, described,and claimed in the copending application entitled Luminaire, filedDecember 31, 1952, Serial No. 328,958, by Robert W. Loehr, which hasbeen assigned to the same assignee as this invention.

Lampholder 30 is provided with a Wire receiving portion 88, which may begenerally rectangular in form and which extends longitudinally outwardfrom the socket receiving portion 28 of lampholder 3i) into the innerend of sleeve 4. Wire receiving portion 88 of lampholder 30 extendstowards the llange l2 within sleeve 4 so as to define generally achamber S2, in conjunction with the Walls of sleeve 4, in which a filmreceptacle 40 and a film holder 90 are located. Wire receiving portion88 is provided with three laterally spaced rectangular recesses 44, onlyoneof which is shown, which extend inwardly end of the central recess44.

from the end of wire receiving portion S8 of lampholder 30 and whichhave their inner ends spaced from socket 42 in the socket receivingportion 28 of lampholder 30. Although not shown, a center contact ofwell known construction and electrical conducting material, such as acopper alloy, is located within socket 42 and is provided with a portionwhich is normally spaced from the inner Such portion of Isuch a centerContact may be secured to the lampholder in any suitable manner such asby means of a screw 156 extending through a suitable opening extendingfrom the recess 38 into the central recess 44. An elongated terminal 4d,of any suitable electrical conducting material such as a copper alloy,is located Within central recess 44 and is provided with a centralthreaded opening to engage the extending end of screw 156 ywhereby thecenter contact is clamped to the base of recess 38 and is electricallyseparated from the socket 42. rIlhe other end of terminal 48 is providedwith a suitable opening so that the stripped end of 4a Suitableelectrical conductor 92 may be secured to the other end of terminal 4Sin any suitable manner, such as by soldering. Either `of the otherrecesses 44 may lbe employed to similarly make an electrical connectionto an inwardly extending ilange portion (not shown) on socket 42 whichis located in engagement with the base of recess 38. In order toadditionally secure socket 42 to lampholder 30 the third recess 44 maybe utilized to engage the iiange portion of socket 42 in a similarmanner. ABy such construction the electrical connections of theconductors 92 to the lampholder 30 are surrounded by high `strengthdielectric material so as to `prevent any likelihood of voltageliashover from the conductors to the lower potential of the luminairehousing.

Referring to Figs. l, 4 and 5, the film receptacle 4t) is formed fromany suitable insulating material such as a molded, glass fibrereinforced, polyester resin. As shown, tfilm receptacle 40 is providedwith a generally rectangular central section 5 which has a reducedgenerally rectangular projection portion 7 extending outwardly from oneside of the central section 5. The outer portion of projection 7 hasmolded therein a pair of spaced inserts 9, 4which may be of any suitablematerial such as steel, so that inserts 9 may be provided with a centralthreaded opening 11. A mounting strap 23, which may be made of anysuitable material such as steel, is provided which extends over theouter ends of inserts 9. Receptacle dit may `then be easily secured toYstrap 23 inuany suitable manner, such as by bolts, extending throughaligned clearance openings in strap-23 and threadedly engaging inserts9. A pair of laterally spaced bosses, not shown, are formed integralwith the portion of the upper wall of sleeve 4 which forms chamber 52,vwhich 'bosses extend inwardly approximately centrally of chamber 52.`

Thu-s, receptacle 4t) may easily be secured to sleeve 4 within chamberSZby any suitable means, such as bolts extending through clearanceopenings at the ends ofstrap 23, whichare ink alignment with the innerends of such bosses, respectively, and `threadedly engaging openings in'the bosses.

The other side of iilm receptacle 40 is providedy with an open endedslot adjacent each of its ends each of which slots 15 extendbetweenopposite sides of they film receptacle 40.y An elongatedelectrical connector block 17, of any suitable electrical conductingmaterial,

such as a copper alloy, is closely received longitudinally' within eachslot 15. As shown, each connecting block 17 is centrally secured to thecentral section 5 ofthe tilm receptacle 40 by means of a bolt 19extending through afcentral clearance opening 25 in each connector block17`which threadedly engages an insert 9'centrally located within eachslot 15. Each connector block 17 is also provided with a longitudinallyinward extending opening 21 at each end thereof for receiving thestripped end of electrical conductors 92 or 99; In order to insure agood electrical'connectiontbetween such inserted'y conductors, athreaded opening is provided adjacent eachA also extends between itssides and is spaced inwardly of each slot 15 so as to form an outwardlyextending blarrier 37 therebetween. Slot`29 is provided with a centralrecess 77 which extends into projection 7 of the receptacle 40 toprovide suiiicient space to receive a portion of the film holderhereinafter described. Slot 29 is also somewhat wider than slots 15 toreceive the free ends of a pair of resilient electrical conductingsingle leaf springs 31 therein, which may be formed from any switchmateria! having such characteristics, such as phosphorus bronze. Asshown, each spring 31 has an outer leg 33 having a clearance openingtherein in alignment with opening 25 in one of the connector blocks 17so that a spring 31 may be both electrically and mechanically secured tothe outer surface of each of the connector blocks 17 by means of bolts19. Each leg 33 extends inwardly from its cooperable connector block 17towards the central slot 29, and in order to provide clearance for leg33 a notch 35 is centrally provided in the outer end of each barrier 37,each of which is of a length to freely receive a leg 33 of spring 31therein. The initial portion of each spring 31 within slot 29 is arcuatein form and, extends inwardly of slot 29. Thereafter each spring 31 isformed with an inwardly extending portion having an elongated inwardlyextending face 39, the inner ends of which are normally biased intoengagement with each other. If desired, the free end of spring 31 withinslot 29 may be bent outwardly from each other to prevent stickingtherebetween. Also if desired, slot 29 may be pro-- vided with anoutwardly extending barrier 41 which extends laterally between the sidesof the slot 29 at each" is approximately the same outer size as i'llmreceptacle 4U. Film holder 90 is provided with a central section 45having a projection 47 thereon extending outwardly from one side ofcentral section 45. The outer end of projection 47 is provided with apair of inserts 9 so that the film receptacle may be secured to a door100, hereinafter described. A centrally located triangular springsupport 49 extends outwardly, to approximately a point, from the otherside of the central section 47 of film holder 9i). Central segment 47 isalso provided with inserts 9 at each lateral side of support 49. A pairof formed single leaf springs 51, which may be similar in material tosprings 31 previously discussed, are provided, each of which has anouter leg 53 which is lsecured to inserts 9 at each side of support 49Iby bolts 55 in a manner as previously discussed. Springs 51 haveangularly outwardly extending portions 57 which engage opposite sides ofthe triangular support 49, respectively, and are each joined to alaterally outwardly extending prong portion 63. Prong portions 63 areformed and spaced laterally a distance at least less than the thicknessof a film cutout so as to frictionally support a film cutout 65ytherebetween. Film cutout 65 may be of any well known wafer typeconstruction comprising at least a pair of laterally spaced conductingmembers may be used, each of which i s separated from its adjacentconducting member by an insulating material. Regardless of which type ofiilm cutout is employed, the insulating material is such that abreakdown of the insulating material will occur when a certain minimumvalue of voltage is applied across the conducting members in engagementwith the prong portions 63 so that an electrical current can flow acrossthe cutout 65.. If desired, the sides of support 49 may be p rovidedwitha groove 3 to closely receive the extending portion 57 therein to insurethat portions 57 are properly supported on iilm holder 9i).

I Referring to Fig. l it will be noted that the lower portion of thesleeve d forming the chamber 52 is provided with an enlarged generallyrectangular opening 7 which is elongated along the longitudinal axis ofsleeve Opening 67 is adapted to be closed by means of a door lili) whichis formed from any suitable material, such as an aluminum alloy, for thesame reasons as housing 2. Door ltlti is slightly larger both laterallyand longitudinally than opening 67 so that it entends beyond each sideand end of opening 67 and engages the outer surface of the lower portionof sleeve 4. Accordingly, such cooperating lower surface on the lowerportion of sleeve 4 is preferably formed so as to be dat so that thedoor lil@ may easily be formed in a fiat form. In order to secure dooriti@ to sleeve door iti-tl is provided with a pair of generally L-shapedlongitudinally spaced formed spring catches 6'?, the short legs of whichrest against the inner surface of door liti@ and are secured thereto inany suitable manner, such as by being riveted thereto. The elongatedlegs of spring catches o?? extend upwardly into the cavity 52 and areprovided with a straight portion which engages the opposite innerlongitudinal spaced ends of opening 67. The upper ends of the elongatedlegs of spring catches 69 are provided with an outwardly extending hookportion 7l. Door l0@ is also provided with a pair of laterally spacedopenings S3 which are in alignment with the spaced inserts 9 in theprojection 47 of film holder @il so that iilin holder 9th may be securedto door itl by means of bolts 73 extending through openings 33 andthreadediy engaging the inserts 9. Further, it will be noted that theend of door lltlti adjacent the bracket receiving portion of sleeve 4 isprovided with an angularly downward extending liange 75.

As shown in Fig. l, film receptacle fili is secured within cavity 52 ofsleeve d so that the slots i5 and 29 extend longitudinally within sleevei whereby a pair of spaced conductors 92 from lampholder 30 and a pairof spaced supply conductors 99 extending through opening i8 may bereadily inserted into laterally spaced openings 2l at opposite ends,respectively, of the connector blocks i7 so that connector blocks f7 areelectrically and mechanically secured to each side of the supply lineand the lamp 46. vFilm receptacle d@ is also secured within cavity 52 sothat the open side of slots l5 and 29 eX- tend towards opening 67,whereby the conductors 92. and 99 may easily be secured to the connectorblocks i7 as indicated from the underside of the luminaire throughopening 67.

As shown in Fig. each spring 3l is formed so that at least a part of theopposed faces 39 are normally biased into engagement with each other. Aseach spring 3l. is electrically and mechanically secured to a connectorblock 17 such engagement of springs 31 constitutes an electrical shuntcircuit across the supply conductors 99. Thus, when springs 3l are inengagement with each other the conductors 92 are shunted so that thelamp portion of the luminaire may be serviced without undue electricalhazard. Springs 3l are also designed to carry the normal current in aseries street lighting circuit for luminaires of this type.

In order that lamp 46 may be energized and in order to protect thecontinuity of a series circuit, faces 39 of springs 31 are forced apartto break the shunt circuit by means of the prong portions 63 of springs51 which prong portions 63 are electrically and mechanically separatedby means of film cutout 65 located therebetween. As indicated, filmholder is secured to door liiil so that the prong portions 63 of springs5l extend inwardly of chamber 52. When door litt) is located to coveropening 67, each prong portion 63 engages the npwardly curved portion ofone of the springs 3l so that upon forcing prongs 63 upwardly the curvedportions of springs are forced apart with each of the faces 39 ofsprings 3i engaging the outer surface of one of the prong portions 63 asshown in Fig. 6. When lm receptacle itl and iilm holder 9i? are solocated, it will be noted that conductors 92 are energized as the shuntcircuit of spi-i' gs 3i is broken with the film cutout 65 being electi'ically located between the spaced faces 39 of springs 3i. Theoperation of a luminaire of this construction in the series circuit isthe saine as that of any series type luminaire. That is, when the lampis energized it is a conducting part of the series circuit until suchtime as the iarnp fails to remain energized. Under such cori-- ditions,the voltage applied across the film cutout will cause the iilm cutout tobreak down so that it supplants the lamp as a. conductor in the seriescircuit in order to maintain the continuity of the series circuit. Thelm cutout will also break down in the event that the lamp does notbecome energized when a voltage is first impressed across the lamp.

As has been indicated, film holder 90 is secured to door so that filmcutout 65 is forced between springs 3i when door 10i) is located tocover the opening 67. As can be appreciated, it is quite desirable thatsuch insertion of the hlm cutout 65 be accomplished in a manner suchthat it is unnecessary to align the prong portions 63 `of the springs 5lwith springs 3l in the film receptacle 49. Thus, as shown in Fig. l, itwill be noted that the spring catch 69 located adjacent the lamp-holder3i) engages the end of opening 67 adjacent the lamp-holder 3i? so thatthe door iii@ is located in a definite fixed relationship longitudinallywith respect to the iilm receptacle 40. The upwardly curved portions ofsprings 3l engage at least one of. the upper edges of one of the prongportions 63 to align the prong portions 63 laterally with respect to lmreceptacle 44B so that upon moving door ititl upwardly such insertion ofthe hlm cutout 65 as described will occur automatically. Upon furtherupward movement of door 19t), it will be noted that the spring catch 69adjacent the bracket receiving portion of sleeve 4 engages the other endof the opening 67 in the well known latch manner. Recess 77 extendslongitudinally within lm receptacle 40 a distance somewhat greater thanthe width of prong portions 63, so that the distance iilm holder 90 isspaced from film receptacle 4t) is not critical once faces 39 of spring31 engage prong portions 63, as the prong portions 63 can be forcedinwardly into recess 77.

As can be easily appreciated upon break down of a lm cutout 65 to shuntthe lamp 46 from the circuit, it is necessary that the iilm cutout bereplaced after the luminaire has been serviced to insure that the lamp46 can be energized again. Replacement of the film cutout isaccomplished by first pulling down on the flange 75 of the door 100which releases the spring catch 69 adjacent the flange 75 and allows thecover door l0@ to drop free from the opening 67 and simultaneouslyremove the iilm cutout 65 from between the faces 39 of springs 31 sothat the shunt circuit of springs 3l is reestablished automatically bythe bias of the springs 31. With the film r holder 9i) removed, it is asimple matter to eject the iilm cutout 65 from between the prongportions 63 of springs 5l and insert a new film cutout 65 therebetween..Although hlm cutout replacement is best made when the j 9 grounding 'theluminaire housing andthe cover Vdoor to the luminaire housing. Suchgrounding of the door 100 to the luminaire may be accomplished in anyone-ot` several suitable ways such as by being permanently hinged to theluminaire or by means of a separate conductor connected to the door 100.

As previously pointed out, it is desired that this invention be notlimited to the particular form of luminaire specifically describedherein, as it will be readily apparent to persons skilled in the artthat various changes and modifications may be made in this particularconstruction without departing from the broad spirit and scope of thisinvention. Accordingly, it is desired that the invention be given abroad scope, and that it be limited only as required by the prior art.

We claim as our invention:

l. A luminaire comprising a dished housing, said housing having anelongated rigid hollow sleeve extending laterally outwardly from saidhousing adjacent the open side thereof, said housing having an openingcommunicating with said sleeve, securing means adjacent the outer end ofsaid sleeve for securing said sleeve to a support, lampholding meansmounted in said housing at la point adjacent said opening and spacedinwardly of said securing means for supporting a light source and toprovide a space in an intermediate portion of said sleeve between saidsecuring means and said lampholding means, an opening in the wall ofsaid portion of the sleeve facing inthe same direction as the open sideof said housing, a film receptacle mounted in said 'portion of thesleeve and having normally engaged separable contacts connected to saidlampholding means and exposed to said sleeve opening, a iilm holder of asize to be insertable through said sleeve opening and having filmcontacts thereon engageable with said receptacle contacts to separatethe latter when the holder is at its operative position in said sleeveportion, and means for releasably holding said film holder at saidoperative position.

lfilm holderk havingA a body of an'ins'ulating material se- 2. Aluminaire comprising a dished housing, said housing having an elongatedrigid hollow sleeve extending laterally outward from said housingadjacent the open side thereof, an opening in said housing communicatingwith said sleeve, securing means adjacent the outer end of said sleeveforsecuring said sleeve to a support, lampholding means mounted in saidhousing at a point adjacent said opening and spaced inwardly of saidsecuring means for supporting a light source and' to provide a space inan intermediate portion of said sleeve between said securing means andsaid lampholding means, an opening in the wall of said portion of the.sleeve facing in the saine direction as the open side of said housing,a film receptacle mounted in said portion of the sleeve and havingnormally engaged separable contacts connected to said lanipholding meansand exposed to said sleeve opening, a film holder of a size tol beinsertable through said sleeve opening and having hlm contacts thereonengageable with said receptacle contacts to separate the latter when theholder is at its operative position in said sleeve portion, a doormember of a size to cover said opening in said sleeve, means on saiddoor member engageable with said sleeve for releasably securing saiddoor mem er over said opening in said sleeve and said liln'; holderbeing secured to said door nien to en gage said lm receptacle when saiddoor member is secured to said sleeve.

3. A luminaire comprising a dished housing, said housing having anelongated rigid hollow sleeve extending laterally outwardly from saidhousing adjacent the open side thereof, said housing having an openingcommunicating with said sleeve, securing means adjacent the outer end ofsaid sleeve for securing said sleeve to a support, lampholding meansmounted in said housing at a point adjacent said opening and spacedinwardly of said securing means for supporting a light source and toprovide a space Vin an intermediate portion of said sleeve between saidsecuring `means and said larnpholding means, an `opening in the ywalliofsaid portion of the `sleeve facing in thesame direction as thevopen-side-of said housing, a filmV .receptaclemounted in said portion'of thesleeve `andvhav-` ing normally engaged separable contacts connectedtosaid lampholding means and exposed to said sleeve opening, said filmreceptacle having terminals located at they opposite sides of the saidreceptacle facing opposite ends of said sleeve, respectively, forreceiving electrical conductors from an electrical source and thelampholding' side therof, said housing having an opening communicat-ving with said sleeve, securing means adjacent the outer end of saidsleeve for securing said sleeve to a support, lampholding means mountedin said housing at a point adjacent said opening and spaced inwardly ofsaid securing means for supporting a light source and to provide a spacein an intermediate portion of said sleeve between said securing meansand said lampholding means, an opening in the wall of said portion ofthe sleeve facing in the same direction as the open side of saidhousing, a lin receptacle having a body of insulating material mountedin said portion of the sleeve and having normally engaged separablecontacts mounted on said kbody and connected to said lampholding meansand exposed to said sleeve opening, a metal door member of a size tocover said opening in said sleeve, means on'said door memberv engageablewith said sleeve forreinovably securing said door member over said'opening in said sleeve, and a cured to said door member to engage saidfilm receptacle when said door member is secured to said sleeve.

5. A luminaire comprising a dished housing, said housing having anelongated rigid hollow sleeve extending laterally outwardly fromsaidhousing adjacent the open side thereof, said rhousing having anopening communicating with said sleeve, securingfmeans adjacent theouter end of said sleeve for' securing said sleeve to a support,lampholding means mounted in said housing at 21 point adjacent saidopeningV and spaced inwardly of said securing means for supporting alight source and to provide a space in an intermediate portion of saidsleeve between said securing means and` said lampholding means, anopening in they wall of said portion` ofthe sleeve facing in the samedirection as the open side of said housing, a lm receptacle mounted insaid portion of the sleeve and having contacts extending arcuatelytoward each other away from said opening and into engagement, saidcontacts being connected to said lainpholding means and exposed to saidsleeve opening, said contacts being engaged along an axis substantiallyparallel with the longitudinal axis of the sleeve, a metal door memberof a size to cover said opening in said sleeve, means on said doormember engageable with said sleeve for removably securing said doormember over said opening in said sleeve, said means pivoting said doormember about an axis substantially at n right angle to the axis ofengagement of said contacts, a film holder secured to said door member,said lm holder having an extending prong, said extending prong engagingsaid film receptacle resilient contacts essentially at their axis ofengagement.

6. A film receptacle comprising an insulating body having a slotcompletely across the insulating body, said slot forming substantiallyparallel barriers on the insulating body, grooved recesses formed insaid barriers and extending substantially parallel to said slot,substantially elongated conducting members secured in said recesses,said recesses being -of a depth sufiicient to receive the elongatedconducting members, each of said conducting members having aperturesextending inwardly from its opposite ends to receive and securely holdelectrical conductors from opposite directions, resilient means securedto each of said electrical conducting members intermediate the endsthereof, and said resilient means having a portion extending outwardlyof said conducting members and inwardly of said insulating body into therecess formed by the slot in the insulating body to resiliently engageeach other.

7. A luminaire comprising a dished housing, said hous- I ing having anelongated rigid hollow sleeve extending laterally outwardly from saidhousing adjacent the open side thereof, said housing having an openingcommunicating with said sleeve, securing means adjacent the outer end ofsaid sleeve for securing said sleeve to a support, lampholding meansmounted in said housing at a point adjacent said opening and spacedinwardly of said securing means for supporting a light source and toprovide a space in an intermediate portion of said sleeve between saidsecuring means and said lampholding means, an opening in the wall ofsaid portion of the sleeve facing in the same direction as the open sideof said housing, a lm receptacle mounted in said portion of the sleeveand having normally engaged separable contacts connected to saidlampholding means and exposed to said sleeve opening, said lm receptaclehaving a pair of spaced termi nal strips mounted on an insulated portionof the receptacle and connected to said contacts, respectively, saidterminal strips being substantially parallel to the longitudinal axis ofsaid hollow sleeve, terminals at each end of said terminal strips toreceive electrical conductors leading tothe outer end of the sleeve andto said lampholding means, respectively, said terminal strips being adirect coupling between the said terminals, a 'lrn holder of a size tobe insertable through said sleeve opening and having lm contacts thereonengageable with said receptacle contacts when in its operative positionin said sleeve portion, and means for releasably holding said filmholder at said operative position.

8. A luminaire comprising a dished housing, said housing having anelongated rigid hollow sleeve extending laterally outwardly from saidhousing adjacent the open side thereof, said housing having an openingcommunicating with said sleeve, securing means adjacent the outer end ofsaid sleeve for secu-ring said sleeve to a support, lampholding meansmounted in said housing at a point adjacent said opening and spacedinwardly of said securing means for supporting a light source and toprovide a space in an intermediate portion of said sleeve between saidsecuring means and said lampholding means, an opening in the wall ofsaid portion of the sleeve facing in the same direction as the open sideof said housing, a tilm receptacle detachably mounted in said portion ofthe sleeve and having normally engaged separable contacts connected tosaid lampholding means and exposed to said sleeve opening, saidreceptacle having securing means to releasably secure said receptacle tothe inside wall of said hollow sleeve opposite said opening in saidsleeve, said opening in the sleeve of a size to accommodate the freepassage of said receptacle, said relcasable securing means exposed tosaid opening, a lilm holder having tilm contacts engageable with saidreceptacle contacts when in its operative position in said sleeveportion, and means for releasably holding said lm holder at saidoperative position.

9. A luminaire comprising a dished housing, said housing having anelongated rigid hollow sleeve extending laterally outwardly from saidhousing adjacent the open side thereof, said housing having an openingcommunicating with said sleeve, securing means adjacent the outer end ofsaid sleeve for securing said sleeve to a support, lampholding meansmounted in said housing at a point adjacent said opening and spacedinwardly of said securing means for supporting a light source and toprovide a space in an intermediate portion of said sleeve between saidsecuring means and said lampholding means, an opening in the wall ofsaid portion of the sleeve facing in the same direction as the open sideof said housing, a film receptacle mounted in said portion of the sleeveand having normally engaged separable contacts connected to saidlarnpholding means and exposed to said sleeve opening, terminalselectrically connected to said contacts and mounted on said receptacleat the opposite sides facing the opposite ends of said sleeve,respectively, and exposed to said sleeve opening so that electricalconnections can be made to said receptacle terminals through said sleeveopening.

References Cited in the tile of this patent UNITED STATES PATENTS Re.14,341 Jones Aug. 7, 1917 1,402,037 Armor Jan. 3, 1922 1,761,496 SheperdJune 3, 1930 1,872,285 Haverstick Aug. 16, 1932 1,873,500 SteinmayerAug. 23, 1932 1,976,657 Cole Oct. 9, 1934 2,232,857 Jackson Feb. 25,1941 FOREIGN PATENTS 13,485 Great Britain Aug. 27, 1890

